What is the use of combiners in the hadoop framework?
What is Schema on Read and Schema on Write?
What is a heartbeat in HDFS?
What is configuration of a typical slave node on Hadoop cluster? How many JVMs run on a slave node?
Explain the features of pseudo mode?
How client application interacts with the NameNode?
How many instances of a jobtracker run on hadoop cluster?
What is zookeeper in hadoop?
Define streaming?
Explain the core components of hadoop?
What is keyvaluetextinputformat?
What is a block and block scanner in HDFS?
What is the heartbeat used for?